Assets

Try a sample
The clip starts from this image and follows its ratio — this endpoint has no ratio parameter

Prompt

Describe the motion you want; there is no need to restate what the image shows

Settings

Resolution
Upstream defaults to 720P. Resolution is a billing dimension, so 1080P costs more per second
Duration
Only 5, 10 or 15 seconds, billed per second
Shot mode
Generate audioUpstream has this on by default; switching it off yields a silent clip
Voice-over URLSupplying one drives the picture and lip sync from your audio — this is the path for talking-head clips
Auto-expand promptOn by default here
Seed
5s × 720P
My generations0